Corrosion protection method of fluoride molten salt and/or chloride molten salt and application of chrome

A molten salt corrosion and chloride technology, applied in the field of material corrosion protection, can solve problems such as corrosion, inability to form a protective surface film, thermodynamic instability, etc., to reduce corrosion rate, slow down intergranular corrosion problems, and be easy to operate and control Effect

Active Publication Date: 2016-03-23
上海联和日环能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention overcomes the thermodynamic instability of chromium element in stainless steel and corrosion-resistant alloy in the prior art in fluoride molten salt and / or chloride molten salt system, selective dissolution occurs, unable to form a protective surface film, and obvious corrosion occurs Defects, providing a corrosion protection method for fluoride molten salt and / or chloride molten salt and the application of chromium

Method used

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  • Corrosion protection method of fluoride molten salt and/or chloride molten salt and application of chrome
  • Corrosion protection method of fluoride molten salt and/or chloride molten salt and application of chrome
  • Corrosion protection method of fluoride molten salt and/or chloride molten salt and application of chrome

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The molten salt system in this embodiment is a static constant temperature system.

[0042] 1. Pretreatment of 316L stainless steel and chromium

[0043] 316L stainless steel and chromium (99.9wt%) were cut into samples with a size of 30 mm × 10 mm × 2 mm by wire cutting method, and a diameter of 316L stainless steel was punched on the sample. hole. The surface of all samples was polished step by step with SiC sandpaper to 2000 mesh, then ultrasonically cleaned with deionized water and absolute ethanol in sequence, and dried with a hair dryer and cold air.

[0044] 2. Corrosion protection method of 316L stainless steel in 700°C FLiNaK molten salt

[0045] figure 1 It is a schematic diagram of the corrosion protection test device in Example 1; wherein, 1 is a 316 stainless steel crucible, 2 is a graphite crucible, 3 is FLiNaK molten salt, 4 is pure chromium, 5 is a 316L stainless steel sample, and 6 is 316L stainless steel wire, 7 for alumina ceramic sheet.

[004...

Embodiment 2

[0049] The molten salt system in this embodiment is a static constant temperature system.

[0050] 1. Pretreatment of 316L stainless steel and chromium

[0051] 316L stainless steel and chromium (99.9wt%) were cut into samples with a size of 30mm×10mm×2mm by wire cutting method, and a diameter of hole. The surface of all samples was polished step by step with SiC sandpaper to 2000 mesh, then ultrasonically cleaned with deionized water and absolute ethanol in sequence, and dried with a hair dryer and cold air.

[0052] 2. Corrosion protection method of 316L stainless steel in 700°C FLiNaK molten salt

[0053] figure 2 It is a schematic diagram of the corrosion protection test device in Example 2; wherein, 1 is a 316 stainless steel crucible, 2 is a graphite crucible, 3 is FLiNaK molten salt, 4 is pure chromium, 5 is a 316L stainless steel sample, and 6 is 316L stainless steel wire, 7 for alumina ceramic sheet.

[0054] Combine 316L stainless steel with chrome in accorda...

Embodiment 3

[0057] The molten salt system in this embodiment is a static constant temperature system.

[0058] 1. Pretreatment of 316 stainless steel and chromium

[0059] 316 stainless steel and chromium (99.9wt%) were cut into samples with a size of 30mm × 10mm × 2mm by wire cutting method, and each sample was punched with a diameter of hole. The surface of all samples was polished step by step with SiC sandpaper to 2000 mesh, then ultrasonically cleaned with deionized water and absolute ethanol in sequence, and dried with a hair dryer and cold air.

[0060] 2. 316 stainless steel at 800°C NaF-ZrF 4 Corrosion protection methods in molten salt

[0061] 316 stainless steel and chromium were added to the experimental crucible, and the 316 stainless steel and chromium were kept in direct contact. Add 550g NaF-ZrF to the crucible 4 (59.5-40.5mol%) molten salt, make the chromium part soak in the molten salt system, cover the graphite cover, put the graphite crucible into the outer layer...

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Abstract

The invention discloses a corrosion protection method of fluoride molten salt and / or chloride molten salt and the application of chrome. The corrosion protection method comprises the step that chrome is added into a fluoride molten salt and / or chloride molten salt system served by stainless steel or corrosion-resistant alloy. The use amount of the chrome meets the requirement that the chrome exists all the time in the protection process. The corrosion protection method is simple, feasible, safe, environmentally friendly, easy to operate and control, and remarkable in effect; by means of the corrosion protection method, the corrosion speed of the high-temperature fluoride molten salt and the chloride molten salt can be decreased remarkably, especially intergranular corrosion of stainless steel can be effectively restrained and relieved, and the service life of the stainless steel in the high-temperature fluoride molten salt and the chloride molten salt is prolonged; in addition, by means of the corrosion protection method of the fluoride molten salt and / or the chloride molten salt and the application of the chrome, the material selection range of alloy structure materials used for fluoride molten salt and chloride molten salt media can be broadened; meanwhile, the unique advantages of the molten slat can be utilized, and the molten salt can serve as novel high-temperature heat transfer and storage media to be applied and popularized in the field of high-temperature energy.

Description

technical field [0001] The invention relates to the field of material corrosion protection, in particular to a corrosion protection method of fluoride molten salt and / or chloride molten salt and the application of chromium. Background technique [0002] Fluoride molten salt and chloride molten salt, as a new type of high-temperature heat transfer and storage medium, have broad application prospects in high-temperature hydrogen production, nuclear reactors, solar thermal power generation, nuclear fuel reprocessing, fuel cells and other energy fields. However, due to the corrosive properties of fluoride molten salt and chloride molten salt to metal structural materials, their wide application in the above fields is limited. [0003] Stainless steel and corrosion-resistant alloys are ASME standard engineering materials, widely used in nuclear energy, thermal power, aviation, aerospace and other high-temperature fields, especially stainless steel has been widely used because of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F13/14
Inventor 孙华俞国军艾华刘华剑谢雷东侯惠奇
Owner 上海联和日环能源科技有限公司
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